Gripping ascenders to hold onto safety ropes as you walk across a ladder on to the Khumbu Icefall, clipping onto a safety rope as you traverse a narrow legde , or adjusting the oxygen flow to avoid hypoxia in the Death Zone are all key aspects and requires your hands to make it feel real", he says.

Robert, also known nicknamed as 'French Spiderman' because of his hi-fly climbing acts, had to use suction gears and mechanical ascenders to reach the observation platform of the 1,273-foot (388 meters) steel structure, since the building had no hand or footholds.

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